I went to the link: http://www.zam.com/giveaways/rift-trial.html
The line that said, "Your previously assigned keys:" had exactly 500 keys listed below, claiming I got them all on the 6th. It was the 7th the first time I ever visited the link. And I only got 1 key.
I assume this is a glitch you guys would like to know about? I can provide some more details, but I don't want to here to prevent others from trying to recreate it.